Hydraulic drive system for construction machines

Details Hydraulic drive system for construction machines Hydraulic drive system for construction machines

1997-01-03

1998-12-15

Nguyen, Hoang

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60459, 60494, F61D 3102

Patent

active

058485317

ABSTRACT:
A hydraulic system for a construction machine includes a hydraulic pump driven by a prime mover, actuators driven by a hydraulic fluid delivered from the hydraulic pump, flow control valves for controlling flow of the hydraulic fluid to the actuators and operation means for operating the flow control valves. A relief value sets a relief pressure for limiting the maximum delivery pressure of the hydraulic pump and relief pressure change means increase or decrease the relief pressure set by the relief valve. The relief pressure change means automatically increase or decrease the relief pressure in accordance with the input amount of the operation means.

REFERENCES:
patent: 5129230 (1992-07-01), Izumi et al.
patent: 5295353 (1994-03-01), Ikari
patent: 5394697 (1995-03-01), Hirata
patent: 5537819 (1996-07-01), Kobayashi
patent: 5680760 (1997-10-01), Lunzman

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